If it fails, it fails. Failure is nothing we can avoid.

Best mindset. I think it is even a step, because things are not going to be successful at the first time.

It all depends on whether the solution consists of small changes that anyone can make in their day to day, because if it requires a lot of effort or a very large change, even on a personal level, it is unlikely that it will happen, it has to be a gradual process, take small steps towards where you want to be in terms as long as those you mention, perhaps ten, twenty, or many more years. I'm a big fan of doing things slowly and gradually, but the right way. Results may take time to arrive, but they will be permanent.